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'''Windows File Protection''' (WFP) is a technology included in all [[Microsoft Windows]] [[operating system]]s beginning with [[Windows 2000]] to prevent programs from replacing critical Windows system files. Protecting core system files prevents problems such as [[DLL hell]] with programs and the operating system. Windows 2000, [[Windows XP]] and [[Windows Server 2003]] include it under the name of ''Windows File Protection''; [[Windows Me]] includes it as ''System File Protection''.
==Overview==
When Windows File Protection is active, replacing or deleting a system file that has no [[File locking|file lock]] to prevent it from being overwritten causes Windows to immediately and silently restore the original copy of the file. The original version of the file is restored from a cached folder which contains backup copies of these files. For the [[Windows NT]] family, the cached folder is located at <tt>%WinDir%\System32\Dllcache</tt>. [[Windows Me]] caches its entire set of compressed cabinet setup files and stores them in the <tt>%Systemroot%\Options\Install</tt> folder.
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